/**
 *       Copyright (c) 2012 Lukas Zaruba
 *
 *   This file is part of Robot Playground.
 *
 *   Robot Playground is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   Robot Playground is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with Robot Playground. If not, see <http://www.gnu.org/licenses/>.
 */
package net.zarubsys.robotplayground.scripting2d.functions;

import java.util.Iterator;
import java.util.List;

import net.zarubsys.commons.scripting.IScriptFunction;
import net.zarubsys.commons.scripting.ParsedStatement;
import net.zarubsys.commons.scripting.ScriptingEnvironment;
import net.zarubsys.commons.scripting.ScriptingException;
import net.zarubsys.robotplayground.scripting2d.Node2D;

/**
 * GetNodeDistance
 *
 * @author Lukas Zaruba, lukas.zaruba@gmail.com
 */
public class GetNodeDistance implements IScriptFunction {

	@Override
	public String getName() {
		return "getNodeDistance";
	}

	@Override
	public int getMinArgsNum() {
		return 2;
	}

	@Override
	public int getMaxArgsNum() {
		return 2;
	}

	@Override
	public Object execute(ScriptingEnvironment env, List<ParsedStatement> args) throws ScriptingException {
		Iterator<ParsedStatement> it = args.iterator();
		Object node1Object = it.next().execute(env);
		if (!(node1Object instanceof Node2D)) {
			throw new IllegalArgumentException("First parameter of function getNodeDistance must be instance of Node2D!!!!");
		}
		Node2D node1 = (Node2D) node1Object;
		
		Object node2Object = it.next().execute(env);
		if (!(node2Object instanceof Node2D)) {
			throw new IllegalArgumentException("Second parameter of function getNodeDistance must be instance of Node2D!!!!");
		}
		Node2D node2 = (Node2D) node2Object;
		
		return getDistance(node1, node2);
	}

	private Object getDistance(Node2D node1, Node2D node2) {
		int dx = node1.getX() - node2.getX();
		int dy = node1.getY() - node2.getY();
		
		return Math.sqrt(dx * dx + dy * dy);
	}

}

